tweak: snippet compiler settings

- Fix build settings to make the snippet compiler to work properly
- Tweak some doc snippets so that they pass snippet compiker check

Related to: #12967

[Cherry-picked 438a17a][modified]

Author: WojciechMazur

library/src/scala/quoted/Quotes.scala

@@ -1599,7 +1599,31 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
       end extension
     end ReturnMethods
 
-    /** Tree representing a variable argument list in the source code */
+    /** Tree representing a variable argument list in the source code.
+     *
+     *  This tree is used to encode varargs terms. The Repeated encapsulates
+     *  the sequence of the elements but needs to be wrapped in a
+     *  `scala.<repeated>[T]` (see `defn.RepeatedParamClass`). For example the
+     *   arguments `1, 2` of `List.apply(1, 2)` can be represented as follows:
+     *
+     *
+     *  ```scala
+     *  //{
+     *  import scala.quoted._
+     *  def inQuotes(using Quotes) = {
+     *    val q: Quotes = summon[Quotes]
+     *    import q.reflect._
+     *  //}
+     *    val intArgs = List(Literal(IntConstant(1)), Literal(IntConstant(2)))
+     *    Typed(
+     *      Repeated(intArgs, TypeTree.of[Int]),
+     *      Inferred(defn.RepeatedParamClass.typeRef.appliedTo(TypeRepr.of[Int]))
+     *    )
+     *  //{
+     *  }
+     *  //}
+     *  ```
+     */
     type Repeated <: Term
 
     /** `TypeTest` that allows testing at runtime in a pattern match if a `Tree` is a `Repeated` */

library/src/scala/util/boundary.scala

@@ -15,14 +15,16 @@ import scala.annotation.implicitNotFound
  *      be rewritten to jumps.
  *
  * Example usage:
+ * 
+ * ```scala
+ * import scala.util.boundary, boundary.break
  *
- *      import scala.util.boundary, boundary.break
- *
- *      def firstIndex[T](xs: List[T], elem: T): Int =
- *        boundary:
- *          for (x, i) <- xs.zipWithIndex do
- *            if x == elem then break(i)
- *          -1
+ * def firstIndex[T](xs: List[T], elem: T): Int =
+ *   boundary:
+ *     for (x, i) <- xs.zipWithIndex do
+ *       if x == elem then break(i)
+ *     -1
+ * ```
  */
 object boundary:
 

project/Build.scala

@@ -2134,29 +2134,36 @@ object ScaladocConfigs {
       .add(VersionsDictionaryUrl("https://scala-lang.org/api/versions.json"))
       .add(DocumentSyntheticTypes(true))
       .add(SnippetCompiler(List(
-        s"${dottyLibRoot}/scala=compile",
+        s"$dottyLibRoot/scala=compile",
+        s"$dottyLibRoot/scala/compiletime=compile",
+        s"$dottyLibRoot/scala/util=compile",
+        s"$dottyLibRoot/scala/util/control=compile"
       )))
       .add(SiteRoot("docs"))
       .add(ApiSubdirectory(true))
       .withTargets(roots)
   }
 
   def stableScala3(version: String) = Def.task {
+    val scalaLibrarySrc = s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/src_managed/main/scala-library-src"
+    val dottyLibrarySrc = s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/src_managed/main/dotty-library-src"
     Scala3.value
       .add(defaultSourceLinks(version + "-bin-SNAPSHOT-nonbootstrapped", version).value)
       .add(ProjectVersion(version))
       .add(SnippetCompiler(
         List(
-          s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/src_managed/main/dotty-library-src/scala/quoted=compile",
-          s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/src_managed/main/dotty-library-src/scala/compiletime=compile"
+          s"$dottyLibrarySrc/scala/quoted=compile",
+          s"$dottyLibrarySrc/scala/compiletime=compile",
+          s"$dottyLibrarySrc/scala/util=compile",
+          s"$dottyLibrarySrc/scala/util/control=compile"
         )
       ))
       .add(CommentSyntax(List(
-        s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/src_managed/main/dotty-library-src=markdown",
-        s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/src_managed/main/scala-library-src=wiki",
+        s"$dottyLibrarySrc=markdown",
+        s"$scalaLibrarySrc=wiki",
         "wiki"
       )))
-      .add(DocRootContent(s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/src_managed/main/scala-library-src/rootdoc.txt"))
+      .add(DocRootContent(s"$scalaLibrarySrc/rootdoc.txt"))
       .withTargets(
         Seq(
           s"out/bootstrap/stdlib-bootstrapped/scala-$version-bin-SNAPSHOT-nonbootstrapped/classes",